
1. To yell "SURPRISE!" after sneaking up to them or similar pranks. Needs to be in a place where she can easily run away after in case the person doesn't take it so well.
Playfulness/Boredom.
2. Asking for help/favors, assuming she's in need and the stranger looks like he would be able and willing to offer some.
Necessity.
3. Someone else motivated/told/asked/forced/enticed/recommended her to.
Relatedness.
4. The stranger in question does something weird but harmless that catches her interest. Like, sorting things in alphabetical order, walking aimlessly up and down, wearing a stupid hat/mask or similar.
Curiosity.
5. The stranger appears to be in distress and nobody else seems willing to help for an extended period of time.
Conscience.
Playfulness/Boredom.
2. Asking for help/favors, assuming she's in need and the stranger looks like he would be able and willing to offer some.
Necessity.
3. Someone else motivated/told/asked/forced/enticed/recommended her to.
Relatedness.
4. The stranger in question does something weird but harmless that catches her interest. Like, sorting things in alphabetical order, walking aimlessly up and down, wearing a stupid hat/mask or similar.
Curiosity.
5. The stranger appears to be in distress and nobody else seems willing to help for an extended period of time.
Conscience.
Please don't mind me.